Ran Haitani and Rindou Haitani are well known delinquents in Japan—and rulers of Ropponggi. Ran, 13 (the older brother), and his classmate , 12, embark on chaotic days after Ran’s accident leaves him with a toddler’s mind. Rindou, 12 (the younger brother), tries desperately to keep Ran out of trouble. Will today bring more mayhem or a miracle?